The person most deserving of suspicion is he who sits with suspect people.
رسولُ اللَّهِ صلى اللَّه عليه وآله : أولى النّاسِ بالتُّهْمةِ مَن جالَسَ أهلَ التُّهْمةِ . الأمالي للصدوق : 73 / 41 .
The Prophet (SAWA) said, 'The person most deserving of suspicion is he who sits with suspect people.' Amali al-Saduq, p. 28, no. 4